Palls



J. RIGG.

MODE OF OOATINO WNOUGHT IRON OR OASI IRON WITH `NNNNBN METALS. N6. 66,636. PatentedJuly 9, 1667.

@nihil tetes @stmt @fitta JAMES RIGG, OF IOWA FALLS, IOWA.

Letters PateutNo. 66,630, dated July 9, 1867.

IMPROVED MODIS 0l.:1 GOATIN G WROUGHTOR GAST IRON WITH A HARDBR METAL.

@the tbculc tcfetret tu in tlgcsc lntets'ittnrt mit making mrt nf the samt.

TO ALL WHOM IT MAY CONOERN:

Be it known that I, JAMES RIGG, of Iowa Falls, in the county of Hardin, and State of Iowa, have invented a new and useful improvement in Coating'Wroughtor Cast- Iron with a- I-Iarder Metal; and Ido hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference beingl had to the accompanying drawings, forminr part of this specification.

This invention relates to a new andimproved method of producing a. hard surface on iron and steel, and it consists in coating the said metals with cast iron, thereby producing a surfenA hard as the hardest steel, and which is susceptible of a high polish and in the manner hereinafter described.

The drawing represents aspecimen of softiron coated with cast iron according to my method The dark portion of Figure 1 shows the soft wrought iron, and Figure 2 represents a cross-section of the same through the line :z: x.

For various purposes it is important to have ahard surface upon metals; especially is this the case Where it is desired to retain the toughness of the iron combined with a hard surface,.and where steel would be too expensive. For various agricultural tools and implements my method is invaluable. i

In carrying out my .invention, I take any article or piece of cast iron, wrought iron, or steel, and after cleaning the surface, I subject the same to a temperature of about seven or eight hundred degrees of heat, and then apply a solution composed of three parts of horax and one part of sal-ammoniac to the prepared surface, and then I plunge the piece into melted cast iron, when the surface will-be coated as desired. I then with-A draw the same from the melted iron and plunge it into a bath of cold salt Water which chills the same, leaving the surface hard as the hardest steel I What I claim as new, and desire to secure by Letters Patent, is

Coating wrought or cast iron with a. harder metal by first applying a suitable. flux and afterwards dipping it while hot into a harder metal in a molten "state, as herein shown and described.

JAMES RIGG.

Witnesses:

O. W. GARRISON, J. A. LADD. 

